Platform hoist



Jan. 11, 1927. f

` D. E. PARRISH PLATFORM HOIST Filed August a, 195,5

Y wherein Athe lifting effort is eXerted vertii .Patented Jan. 11, 1927.

PATENT OFFICE.

DONALD EVANS PARRISH, 'OF BUFFALO, N E/V YORK, ASSIGNOR TO HERBERT MORRIS INCORPORATED, OF BUFFALO, NEN YORK, A CORFORATON OF NEWy YORK.

PLATFORM Hersfr.v

.Application filed August 8, 1925.

andthe object lofthe invention is to devise.`

a hoist which is sl'idably mounted upon two vertical guides, the platform `being raised and lowered *byl means of a chain block7 cally, in a straight line, and not around a series ofpulleys. A further object of the invention is yto Vsuspend theY hoist platform betweenY the guides so that it will project equidista-ntly upon either side thereof, the chain block being positioned above one projecting end, the .other end being supported by two pairs of rollers, one pair of which are positioned upon each side of the platfornn-engagingthe vertical guide-s and thus transforming the vertical lifting force into a pair of'opposed horizontal forces passing through the axesy of the respective upper and lower rollers of each pair. A still further object of the invention isto provide a pair of Vrollers one -on each side of the platform for preventing a side to side or swinging motion thereof, the rollers being on a parallel plane `to and running upon the pair of vertical guides.

My invention consists of a platform hoist constructed and arranged all as hereinafter more particularly.described and illustrated in the accompanying drawing in which Fior. 1 is a ers ective View of m hoisty showing it positioned in the corner of a basementin proximity toene of the basement windows through which the ash cans are removed.

Fig. 2 is a horizontal plan sectional view taken through the vertical guide members and showing the hoist platform.

Fig. 3 is a side elevational view of an alternative construction in which the hoist platform does not extend between the vertical guides but is positioned on one side thereof, the roller supporting frames being rovided with extensions, to the ends of which the hoisting chains are attached. This form of hoist embodies the same principle as theconstruction shown in Figure l but is preferably used where it is desired to raise the hoist platform to the level of a doorway or a second elevated platform.

Fig. 4 is an enlarged plan sectional view through one of the vertical guides of the Serial No. 49,084.

alternative construction shown inl Figure 3 a fragmentary portion of thehoist pla-tfoim being'shown.

Lilie characters of reference indicate corresponding parts in the different views.

' 1 and 2.are a pair of vertically disposed guides being preferably constructed of angle iron and secured at their base to theffloor of the basement by means of embeddedy plates 3 held in position at the top by a horizontally disposedplate i which extends from one of the basement walls andv is adapted to support the chain block 5 which is mounted upon a pair ofdepending brackets 6y which -aresecured to its under side.

`The ash can supporting means consists of or any other suitablemeans, andi;

a horizontallyl lpositioned,platform 7.;w;hich i extends between the vertical guides 1,; xml2 and is provided with a pair of upwardly leX- tending sides 8 and 9. 1Q andl -11 arethe lifting chains of the chainblocks and-are secured at their lower ends tothe respective sides 8 and 9 being attached;intermediatelyV -ot the distancebetween the inner I ends of."

the sides and the vertical,y guides 1 and 2.

i For supportingthe outer end ofthe plat- 'torin which projects between the vertical guides, I provide upper and lower rollers l2 and 13-uponthe outer faces; of thefdesi 8f;

and 9. These rollers engage the vertical guides 1 and 2 as clearly shown in Figure 1, that is the upper rollers 12 engage the respective inner faces of the'vertical members and the lower rollers 13 engage their outer faces. For holding, the platformin transverse alignment with the guides 1 and 2 I provide outwardly extending lugs 14 upon the outer faces of the sides 8 and 9. These lugs being adapted to carry rollers 15 which also engage the respective guides 1 and 2. The plane ofthe rollers 15 being at right angles to the plane of the rollers 12 and 13 and consequently engaging the side faces of the guides.

In the alternative construction shownin igui'es 3 and 4i it will be seen that the platgle irons which constitute the guides 1 and 2 are turned in the opposite direction to the angle irons used in the construction shown in Figure l which permit the roller carrying frames lo being positioned upon the outer side of the guides, thus facilitating the rapid erection of the hoist.

l am aware that hoists embodying upper and lower rollers engaging the front and rear faces of ve; ical guide members are at present in use but owing to the fact that the lifting el'lort is exerted either between the vertical planes passing through the arles of the upper and louer rollers or in the plane passing through the airis of the upper roller, the plaforin has a tendency to bind as the vertical lifting force is only transformed into a single horizontal force acting through the ailes of the lower roilers. ln my construction when the load is more. or less uniformly distributed over the platform the lifting force acts directly upon the portion of the load positioned about 'the lifting chains and lthe lifting effort required to raise the re mainder oi Ae load which is positioned upon the outer end of, or the portion of the platform Which pr jects between the guides is transformed into two substantially equal and opposite horizontal forces acting through the aires of the respective upper and loWer pulleys. lt 1ivill be seen in my construction that the lifting effort is more evenly distributed and that by the use of a single chain block with a straight pull on the endless hand chain the operating effort is reduced to the easiest possible motion. Furthermore by mounting the lifting gears directly under the top plate no entra floor space is used. lt will be und :stood that in cases Where heavy loads have to be rapidly and constantly lifted that power means may be provider` for operating the chain block in lieu of the hand chain Without departing from the spirit of my invention.

From the foregoing description it will be apparent that l hare devised a very simply the platform respectively engaging the frontV and rear faces of the guide members and supporting the portion of the platform projecting beyond the front faces of the vertical guide members, a pair of rollers'each positioned between the horizontal axial planes of the loiver and upper rollers and adapted to engage the side faces of the vertical guide members, and platform hoisting means positioned in paralie1 relation to the vertical guide members engaging the plat form at a point intermediate of the rear end of the platform and the rear faces of the guide members so that it of the guide members, Y

2. A. hoist comprising a movable platform, platform hoisting means engaging the platform in the vicinity of its rear end, a pair of vertically positioned guides through which the forward end of the platform projects, loiver and upper rollers on the plat-- form respectively engaging the front and rear faces of the guide members, a pair of rollers each positioned upon the platform nd each engaging a side face of a vertical guide member, said sets of rollers constituting a support for the forward end of the platform and a. means for preventing side rocking motion of the platform in respect to the guide members, said platform hoisting means constituting a support for the rear portion of the platform.

DONALD EVANS PARRISH.

supports Vthe por tion of the platform entending rearwardly 

